Sub-device configuration models define what V4L2 API elements are available on a compliant sub-device and how do they behave. The patch also adds a model for common raw sensors. Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx> --- .../media/drivers/camera-sensor.rst | 4 + .../media/v4l/common-raw-sensor.dia | 441 ++++++++++++++++++ .../media/v4l/common-raw-sensor.svg | 134 ++++++ .../userspace-api/media/v4l/dev-subdev.rst | 2 + .../media/v4l/subdev-config-model.rst | 203 ++++++++ 5 files changed, 784 insertions(+) create mode 100644 Documentation/userspace-api/media/v4l/common-raw-sensor.dia create mode 100644 Documentation/userspace-api/media/v4l/common-raw-sensor.svg create mode 100644 Documentation/userspace-api/media/v4l/subdev-config-model.rst diff --git a/Documentation/userspace-api/media/drivers/camera-sensor.rst b/Documentation/userspace-api/media/drivers/camera-sensor.rst index bc55c861fb69..5bc4c79d230c 100644 --- a/Documentation/userspace-api/media/drivers/camera-sensor.rst +++ b/Documentation/userspace-api/media/drivers/camera-sensor.rst @@ -18,6 +18,8 @@ binning functionality. The sensor drivers belong to two distinct classes, freely configurable and register list-based drivers, depending on how the driver configures this functionality. +Also see :ref:`media_subdev_config_model_common_raw_sensor`. + Freely configurable camera sensor drivers ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ @@ -105,6 +107,8 @@ values programmed by the register sequences. The default values of these controls shall be 0 (disabled). Especially these controls shall not be inverted, independently of the sensor's mounting rotation. +.. _media_using_camera_sensor_drivers_embedded_data: + Embedded data ------------- diff --git a/Documentation/userspace-api/media/v4l/common-raw-sensor.dia b/Documentation/userspace-api/media/v4l/common-raw-sensor.dia new file mode 100644 index 000000000000..aa927527eae3 --- /dev/null +++ b/Documentation/userspace-api/media/v4l/common-raw-sensor.dia @@ -0,0 +1,441 @@ +<?xml version="1.0" encoding="UTF-8"?> +<dia:diagram xmlns:dia="http://www.lysator.liu.se/~alla/dia/";> + <dia:diagramdata> + <dia:attribute name="background"> + <dia:color val="#ffffffff"/> + </dia:attribute> + <dia:attribute name="pagebreak"> + <dia:color val="#000099ff"/> + </dia:attribute> + <dia:attribute name="paper"> + <dia:composite type="paper"> + <dia:attribute name="name"> + <dia:string>#A4#</dia:string> + </dia:attribute> + <dia:attribute name="tmargin"> + <dia:real val="2.8222"/> + </dia:attribute> + 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The embedded data format does not need to be configured on the sensor's pads as the format is dictated by the pixel data format in this case. + +.. include:: subdev-config-model.rst diff --git a/Documentation/userspace-api/media/v4l/subdev-config-model.rst b/Documentation/userspace-api/media/v4l/subdev-config-model.rst new file mode 100644 index 000000000000..25030b80734f --- /dev/null +++ b/Documentation/userspace-api/media/v4l/subdev-config-model.rst @@ -0,0 +1,203 @@ +.. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later + +.. _media_subdev_config_model: + +Sub-device configuration models +=============================== + +A sub-device configuration model specifies in detail what the user space can +expect from a sub-device in terms of V4L2 sub-device interface support, +including IOCTL (including selection targets and controls) semantics. + +A sub-device may implement more than one configuration model at the same +time. The implemented configuration models can be obtained from the sub-device's +``V4L2_CID_CONFIG_MODEL`` control. + +.. _media_subdev_config_model_common_raw_sensor: + +Common raw camera sensor model +------------------------------ + +The common raw camera sensor model defines a set of enumeration and +configuration interfaces (formats, selections etc.) that cover the vast majority +of funcitionality of raw camera sensors. Not all of the interfaces are +necessarily offered by all drivers. + +A sub-device complies with the common raw sensor model if the +``V4L2_CONFIG_MODEL_COMMON_RAW`` bit is set in the ``V4L2_CID_CONFIG_MODEL`` +control of the sub-device. + +The common raw camera sensor model is aligned with +:ref:`media_using_camera_sensor_drivers`. Please refer to that regarding aspects +not specified here. + +Each camera sensor implementing the common raw sensor model exposes a single +V4L2 sub-device. The sub-device contains a single source pad (0) and two or more +internal pads: an image data internal pad (1) and optionally an embedded data +pad (2). Additionally, further internal pads may be supported for other +features, in which case they are documented separately for the given device. + +This is shown in :ref:`media_subdev_config_model_common_raw_sensor_subdev`. + +.. _media_subdev_config_model_common_raw_sensor_subdev: + +.. kernel-figure:: common-raw-sensor.svg + :alt: common-raw-sensor.svg + :align: center + + **Common raw sensor sub-device** + +Routes +^^^^^^ + +A sub-device conforming to common raw camera sensor model implements the +following routes. + +.. flat-table:: Routes + :header-rows: 1 + + * - Sink pad/stream + - Source pad/stream + - Static (X/M(aybe)/-) + - Mandatory (X/-) + - Synopsis + * - 1/0 + - 0/0 + - X + - X + - Image data + * - 2/0 + - 0/1 + - M + - \- + - Embedded data + +Some devices do not support the embedded data stream, others do support it and +in some of the latter, it can be turned on and off before streaming is started. + +Sensor pixel array size, cropping and binning +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +The sensor's pixel array is divided into one or more areas. The areas around the +edge of the pixel array, usually one or more sides, may contain optical black +pixels, dummy pixels and other non-image pixels. + +A rectangle within the pixel array contains the visible pixels. Capturing the +non-visible pixels may be supported by the sensor. + +The sensor can perform three operations that affect the output image size. First +comes analogue crop. This configuration limits parts of the pixel array which +the sensor will read, affecting sensor timing as well. The granularity of the +analogue crop configuration varies greatly across sensors: some sensors support +a few different analogue crop configurations whereas others may support anything +divisible by a given number of pixels. + +The default analogue crop rectangle corresponds to the visible pixel area. + +In the next step, binning is performed on the image data read from camera +sensor's pixel array. This will effectively result in an image smaller than the +original by given binning factors horizontally and vertically. Typical values +are 1/2 and 1/3 but others may well be supported by the hardware as well. + +Sub-sampling follows binning. Sub-sampling, like binning, reduces the size of +the image by including only a subset of samples read from the sensor's pixel +matrix, typically every n'th pixel horizontally and vertically, taking the +sensor's colour pattern into account. Sub-sampling is generally configurable +separately horizontally and vertically. + +Scaling is further done after sub-sampling. Scaling generally is fine grainer +than binning or sub-sampling. + +The binning, sub-sampling and scaling operations are configured using the +compose rectangle. It depends on the driver which of these operations are being +used to achieve the resulting size. + +The combination of the analogue crop and binning, sub-sampling and scaling +operations may result in an image size that may be larger than desirable. For +this purpose, a digital crop operation may be performed on the image after these +operations. The resulting image size is further output by the sensor. + +Drivers may only support some of even none of these configurations, in which +case they do not expose the corresponding selection rectangles. + +Also refer to :ref:`Selection targets <v4l2-selection-targets-table>`. + +.. flat-table:: Selection targets on pads + :header-rows: 1 + + * - Pad/Stream + - Selection target/format + - Mandatory (X/-) + - Modifiable (X/-) + - Synopsis + * - 1/0 + - Format + - X + - \- + - Image data format. The width and height fields of this format are the + same than those for the V4L2_SEL_TGT_CROP_BOUNDS rectangle. The media + bus code of this format reflects the native pixel depth of the sensor. + * - 1/0 + - V4L2_SEL_TGT_CROP_BOUNDS + - X + - \- + - The full pixel area, including non-visible pixels. No pixels outside + this area can be captured. This rectangle is relative to the format on + the same (pad, stream). + * - 1/0 + - V4L2_SEL_TGT_CROP_DEFAULT + - X + - \ + - The visible pixel area. This rectangle is relative to the format on the + same (pad, stream). + * - 1/0 + - V4L2_SEL_TGT_CROP + - \- + - X + - Analogue crop. Analogue crop typically has a coarse granularity. This + rectangle is relative to the format on the same (pad, stream). + * - 1/0 + - V4L2_SEL_TGT_COMPOSE + - \- + - X + - Binning, sub-sampling and scaling. This rectangle is relative to the + V4L2_SEL_TGT_CROP rectangle on the same (pad, stream). The combination + of binning, sub-sampling and scaling is configured using this selection + target. + * - 2/0 + - Format + - X + - \- + - Embedded data format. + * - 0/0 + - V4L2_SEL_TGT_CROP + - \- + - X + - Digital crop. This rectangle is relative to the V4L2_SEL_TGT_COMPOSE + rectangle on (pad, stream) pair 1/0. + * - 0/0 + - Format + - X + - X + - Image data source format. The width and height fields of the format are + the same than for the V4L2_SEL_TGT_CROP rectangle on (pad, stream) pair + 0/0 and the media bus code reflects the pixel data output of the sensor. + * - 0/1 + - Format + - X + - \- + - Embedded data source format. + +Embedded data +^^^^^^^^^^^^^ + +The embedded data stream is produced by the sensor when the corresponding route +is enabled. The embedded data route may also be immutable or not exist at all, +in case the sensor (or the driver) does not support it. + +Generally the sensor embedded data width is determined by the width of the image +data whereas the number of lines are constant for the embedded data. The user +space may obtain the size of the embedded data once the image data size on the +source pad has been configured. + +Also see :ref:`media_using_camera_sensor_drivers_embedded_data`. -- 2.39.5
